private static boolean isWifi(Context mContext) {    
    ConnectivityManager connectivityManager = (ConnectivityManager) mContext    
            .getSystemService(Context.CONNECTIVITY_SERVICE);    
    NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo();    
    if (activeNetInfo != null
 
    
            && activeNetInfo.getType() == ConnectivityManager.TYPE_WIFI) {    
        return true;    
    }    
    return false;    
}